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Added function computeOffsetforLocalVar to check how big the

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offset-from-FP will be before allocating space for a local variable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1905 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vikram S. Adve 2002-03-18 03:36:30 +00:00
parent c356e565a6
commit 89e2da034a
1 changed files with 75 additions and 60 deletions
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135
lib/CodeGen/MachineFunction.cpp
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@ -29,8 +29,9 @@ static AnnotationID MCFM_AID(
// This should not be called before "construct()"
// for a given Method.
//
MachineCodeForMethod &MachineCodeForMethod::construct(const Method *M,
const TargetMachine &Tar){
MachineCodeForMethod&
MachineCodeForMethod::construct(const Method *M, const TargetMachine &Tar)
{
assert(M->getAnnotation(MCFM_AID) == 0 &&
"Object already exists for this method!");
MachineCodeForMethod* mcInfo = new MachineCodeForMethod(M, Tar);
@ -38,13 +39,16 @@ MachineCodeForMethod &MachineCodeForMethod::construct(const Method *M,
return *mcInfo;
}
void MachineCodeForMethod::destruct(const Method *M) {
void
MachineCodeForMethod::destruct(const Method *M)
{
bool Deleted = M->deleteAnnotation(MCFM_AID);
assert(Deleted && "Machine code did not exist for method!");
}
MachineCodeForMethod &MachineCodeForMethod::get(const Method* method) {
MachineCodeForMethod&
MachineCodeForMethod::get(const Method* method)
{
MachineCodeForMethod* mc = (MachineCodeForMethod*)
method->getAnnotation(MCFM_AID);
assert(mc && "Call construct() method first to allocate the object");
@ -59,34 +63,37 @@ ComputeMaxOptionalArgsSize(const TargetMachine& target, const Method* method)
unsigned int maxSize = 0;
for (Method::const_iterator MI=method->begin(), ME=method->end();
MI != ME; ++MI) {
const BasicBlock *BB = *MI;
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I)
if (CallInst *callInst = dyn_cast<CallInst>(*I)) {
unsigned int numOperands = callInst->getNumOperands() - 1;
int numExtra = (int) numOperands - frameInfo.getNumFixedOutgoingArgs();
if (numExtra <= 0)
continue;
unsigned int sizeForThisCall;
if (frameInfo.argsOnStackHaveFixedSize())
MI != ME; ++MI)
{
const BasicBlock *BB = *MI;
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I)
if (CallInst *callInst = dyn_cast<CallInst>(*I))
{
int argSize = frameInfo.getSizeOfEachArgOnStack();
sizeForThisCall = numExtra * (unsigned) argSize;
unsigned int numOperands = callInst->getNumOperands() - 1;
int numExtra = (int) numOperands - frameInfo.getNumFixedOutgoingArgs();
if (numExtra <= 0)
continue;
unsigned int sizeForThisCall;
if (frameInfo.argsOnStackHaveFixedSize())
{
int argSize = frameInfo.getSizeOfEachArgOnStack();
sizeForThisCall = numExtra * (unsigned) argSize;
}
else
{
assert(0 && "UNTESTED CODE: Size per stack argument is not fixed on this architecture: use actual arg sizes to compute MaxOptionalArgsSize");
sizeForThisCall = 0;
for (unsigned i=0; i < numOperands; ++i)
sizeForThisCall += target.findOptimalStorageSize(callInst->
getOperand(i)->getType());
}
if (maxSize < sizeForThisCall)
maxSize = sizeForThisCall;
}
else
{
assert(0 && "UNTESTED CODE: Size per stack argument is not fixed on this architecture: use actual arg sizes to compute MaxOptionalArgsSize");
sizeForThisCall = 0;
for (unsigned i=0; i < numOperands; ++i)
sizeForThisCall += target.findOptimalStorageSize(callInst->
getOperand(i)->getType());
}
if (maxSize < sizeForThisCall)
maxSize = sizeForThisCall;
}
}
}
return maxSize;
}
@ -120,8 +127,41 @@ MachineCodeForMethod::MachineCodeForMethod(const Method* _M,
currentTmpValuesSize(0)
{
maxOptionalArgsSize = ComputeMaxOptionalArgsSize(target, method);
staticStackSize = maxOptionalArgsSize +
target.getFrameInfo().getMinStackFrameSize();
staticStackSize = maxOptionalArgsSize
+ target.getFrameInfo().getMinStackFrameSize();
}
int
MachineCodeForMethod::computeOffsetforLocalVar(const TargetMachine& target,
const Value* val,
unsigned int size)
{
bool growUp;
int firstOffset =target.getFrameInfo().getFirstAutomaticVarOffset(*this,
growUp);
unsigned char align;
if (size == 0)
{
size = target.findOptimalStorageSize(val->getType());
// align = target.DataLayout.getTypeAlignment(val->getType());
}
align = SizeToAlignment(size, target);
int offset = getAutomaticVarsSize();
if (! growUp)
offset += size;
if (unsigned int mod = offset % align)
{
offset += align - mod;
size += align - mod;
}
offset = growUp? firstOffset + offset
: firstOffset - offset;
return offset;
}
int
@ -134,38 +174,13 @@ MachineCodeForMethod::allocateLocalVar(const TargetMachine& target,
int offset = getOffset(val);
if (offset == INVALID_FRAME_OFFSET)
{
bool growUp;
int firstOffset =target.getFrameInfo().getFirstAutomaticVarOffset(*this,
growUp);
unsigned char align;
if (size == 0)
{
size = target.findOptimalStorageSize(val->getType());
// align = target.DataLayout.getTypeAlignment(val->getType());
}
align = SizeToAlignment(size, target);
offset = getAutomaticVarsSize();
if (! growUp)
offset += size;
if (unsigned int mod = offset % align)
{
offset += align - mod;
size += align - mod;
}
offset = growUp? firstOffset + offset
: firstOffset - offset;
offset = this->computeOffsetforLocalVar(target, val, size);
offsets[val] = offset;
incrementAutomaticVarsSize(size);
}
return offset;
}
int
MachineCodeForMethod::allocateSpilledValue(const TargetMachine& target,
const Type* type)